I just don't understand why HN readers are so eager to paint Greenspan as a whiner and Zuckerberg as a rightful victor, as if that's the only thing worth saying about this whole commotion. It seems like a very dim view of human potential to me - winning is all that counts, if being a shit means you win, good on ya, and anyone that challenges that is just a whiner.
After all, Greenspan doesn't say that M -shouldn't- have been successful - he does not argue with moral absolutes (or maybe he does and I need to re-read the piece). He argues that eventually that sort of shitty behaviour will catch up with you, no matter what, even if you are the CEO of Facebook. Like I've said in other comments, it sounds like a warning.
Plus shouldn't HN readers be interested in more than just raw victory? If you view the modern tech world as a zero-sum arena, I feel bad for you son. Modern tech is about collaboration, synergy, and finding an approach that authentically makes sense for you in relation to what others are doing. This bloodthirsty power stuff is just a juvenile phase.
(NB: not to take away from all of that Zuck has clearly accomplished at Facebook; its had a huge and rightful impact on the world and our lives.)